[PATCH] cifs: fix return code when failing to rename a file onto a directory

[PATCH] cifs: fix return code when failing to rename a file onto a directory

[Ronnie Sahlberg]

Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
directory. This is different from xfstest where we expect this to return
-EEXIST instead.

As a workaround, if we failed to rename the file and we got -EACCES
then try to open the target file and check the attributes if it is a
directory or not and if so remap the error to -EEXIST.

This makes us pass xfstest  generic/245

Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 fs/cifs/smb2ops.c   | 40 ++++++++++++++++++++++++++++++++++++++++
 fs/cifs/smb2pdu.c   | 12 +++++++++++-
 fs/cifs/smb2proto.h |  2 ++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index bdb963d0ba32..5a620c71d91f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -426,6 +426,46 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 	return rc;
 }
 
+int
+smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
+	    __le16 *target_file, int *is_dir)
+{
+	int rc;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct smb2_file_all_info *smb2_data;
+
+	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
+			    GFP_KERNEL);
+	if (smb2_data == NULL)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, target_file, &oplock, NULL, NULL);
+	if (rc)
+		goto out;
+
+	rc = SMB2_query_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			     smb2_data);
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	if (rc)
+		goto out;
+
+	*is_dir = !!(le32_to_cpu(smb2_data->Attributes) &
+		     FILE_ATTRIBUTE_DIRECTORY);
+
+out:
+	kfree(smb2_data);
+	return rc;
+}
+
 #ifdef CONFIG_CIFS_XATTR
 static ssize_t
 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 553d574940b9..ec5de0a23378 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3144,7 +3144,7 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 	struct smb2_file_rename_info info;
 	void **data;
 	unsigned int size[2];
-	int rc;
+	int rc, is_dir;
 	int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
 
 	data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
@@ -3165,6 +3165,16 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 	rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
 		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
 		0, 2, data, size);
+
+	/* SMB2 servers responds with ACCESS_DENIED when trying to rename
+	 * and replace onto a non-empty directory. Check for this and remap
+	 * to EEXIST.
+	 */
+	if (rc == -EACCES) {
+		if (!smb2_is_dir(xid, tcon, target_file, &is_dir) && is_dir)
+			rc = -EEXIST;
+	}
+
 	kfree(data);
 	return rc;
 }
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index e9ab5227e7a8..a7528c0941c6 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -203,4 +203,6 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
 
 extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
 					enum securityEnum);
+extern int smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
+		       __le16 *target_file, int *is_dir);
 #endif			/* _SMB2PROTO_H */
-- 
2.13.3

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[Pavel Shilovsky]

2017-11-09 15:52 GMT-08:00 Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>:
> Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
> directory. This is different from xfstest where we expect this to return
> -EEXIST instead.
>
> As a workaround, if we failed to rename the file and we got -EACCES
> then try to open the target file and check the attributes if it is a
> directory or not and if so remap the error to -EEXIST.
>
> This makes us pass xfstest  generic/245
>
> Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  fs/cifs/smb2ops.c   | 40 ++++++++++++++++++++++++++++++++++++++++
>  fs/cifs/smb2pdu.c   | 12 +++++++++++-
>  fs/cifs/smb2proto.h |  2 ++
>  3 files changed, 53 insertions(+), 1 deletion(-)
>
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index bdb963d0ba32..5a620c71d91f 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -426,6 +426,46 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
>         return rc;
>  }
>
> +int
> +smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
> +           __le16 *target_file, int *is_dir)
> +{
> +       int rc;
> +       u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
> +       struct cifs_open_parms oparms;
> +       struct cifs_fid fid;
> +       struct smb2_file_all_info *smb2_data;
> +
> +       smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
> +                           GFP_KERNEL);
> +       if (smb2_data == NULL)
> +               return -ENOMEM;
> +
> +       oparms.tcon = tcon;
> +       oparms.desired_access = FILE_READ_ATTRIBUTES;
> +       oparms.disposition = FILE_OPEN;
> +       oparms.create_options = 0;
> +       oparms.fid = &fid;
> +       oparms.reconnect = false;
> +
> +       rc = SMB2_open(xid, &oparms, target_file, &oplock, NULL, NULL);
> +       if (rc)
> +               goto out;
> +
> +       rc = SMB2_query_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
> +                            smb2_data);

Can't we use FILE_DIRECTORY_FILE flag in CreateOptions of SMB2_CREATE
command and avoid querying attributes from the server? This will save
us 1 or 2 round trips.


> +       SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
> +       if (rc)
> +               goto out;
> +
> +       *is_dir = !!(le32_to_cpu(smb2_data->Attributes) &
> +                    FILE_ATTRIBUTE_DIRECTORY);
> +
> +out:
> +       kfree(smb2_data);
> +       return rc;
> +}
> +
>  #ifdef CONFIG_CIFS_XATTR
>  static ssize_t
>  move_smb2_ea_to_cifs(char *dst, size_t dst_size,
> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
> index 553d574940b9..ec5de0a23378 100644
> --- a/fs/cifs/smb2pdu.c
> +++ b/fs/cifs/smb2pdu.c
> @@ -3144,7 +3144,7 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>         struct smb2_file_rename_info info;
>         void **data;
>         unsigned int size[2];
> -       int rc;
> +       int rc, is_dir;
>         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
>
>         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
> @@ -3165,6 +3165,16 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
>                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
>                 0, 2, data, size);
> +
> +       /* SMB2 servers responds with ACCESS_DENIED when trying to rename
> +        * and replace onto a non-empty directory. Check for this and remap
> +        * to EEXIST.
> +        */
> +       if (rc == -EACCES) {
> +               if (!smb2_is_dir(xid, tcon, target_file, &is_dir) && is_dir)
> +                       rc = -EEXIST;
> +       }

What if the target is directory but the permissions are read-only?

> +
>         kfree(data);
>         return rc;
>  }
> diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
> index e9ab5227e7a8..a7528c0941c6 100644
> --- a/fs/cifs/smb2proto.h
> +++ b/fs/cifs/smb2proto.h
> @@ -203,4 +203,6 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
>
>  extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
>                                         enum securityEnum);
> +extern int smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
> +                      __le16 *target_file, int *is_dir);
>  #endif                 /* _SMB2PROTO_H */
> --
> 2.13.3
>
> --
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--
Best regards,
Pavel Shilovsky

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[Steve French]

On Thu, Nov 16, 2017 at 5:31 PM, Pavel Shilovsky <piastryyy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 2017-11-09 15:52 GMT-08:00 Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>:
>> Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
>> directory. This is different from xfstest where we expect this to return
>> -EEXIST instead.
>>
>> As a workaround, if we failed to rename the file and we got -EACCES
>> then try to open the target file and check the attributes if it is a
>> directory or not and if so remap the error to -EEXIST.
>>
>> This makes us pass xfstest  generic/245
>>
>> Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>>  fs/cifs/smb2ops.c   | 40 ++++++++++++++++++++++++++++++++++++++++
>>  fs/cifs/smb2pdu.c   | 12 +++++++++++-
>>  fs/cifs/smb2proto.h |  2 ++
>>  3 files changed, 53 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
>> index bdb963d0ba32..5a620c71d91f 100644
>> --- a/fs/cifs/smb2ops.c
>> +++ b/fs/cifs/smb2ops.c
>> @@ -426,6 +426,46 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
>>         return rc;
>>  }
>>
>> +int
>> +smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
>> +           __le16 *target_file, int *is_dir)
>> +{
>> +       int rc;
>> +       u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
>> +       struct cifs_open_parms oparms;
>> +       struct cifs_fid fid;
>> +       struct smb2_file_all_info *smb2_data;
>> +
>> +       smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
>> +                           GFP_KERNEL);
>> +       if (smb2_data == NULL)
>> +               return -ENOMEM;
>> +
>> +       oparms.tcon = tcon;
>> +       oparms.desired_access = FILE_READ_ATTRIBUTES;
>> +       oparms.disposition = FILE_OPEN;
>> +       oparms.create_options = 0;
>> +       oparms.fid = &fid;
>> +       oparms.reconnect = false;
>> +
>> +       rc = SMB2_open(xid, &oparms, target_file, &oplock, NULL, NULL);
>> +       if (rc)
>> +               goto out;
>> +
>> +       rc = SMB2_query_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
>> +                            smb2_data);
>
> Can't we use FILE_DIRECTORY_FILE flag in CreateOptions of SMB2_CREATE
> command and avoid querying attributes from the server? This will save
> us 1 or 2 round trips.
>
>
>> +       SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
>> +       if (rc)
>> +               goto out;
>> +
>> +       *is_dir = !!(le32_to_cpu(smb2_data->Attributes) &
>> +                    FILE_ATTRIBUTE_DIRECTORY);
>> +
>> +out:
>> +       kfree(smb2_data);
>> +       return rc;
>> +}
>> +
>>  #ifdef CONFIG_CIFS_XATTR
>>  static ssize_t
>>  move_smb2_ea_to_cifs(char *dst, size_t dst_size,
>> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
>> index 553d574940b9..ec5de0a23378 100644
>> --- a/fs/cifs/smb2pdu.c
>> +++ b/fs/cifs/smb2pdu.c
>> @@ -3144,7 +3144,7 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>>         struct smb2_file_rename_info info;
>>         void **data;
>>         unsigned int size[2];
>> -       int rc;
>> +       int rc, is_dir;
>>         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
>>
>>         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
>> @@ -3165,6 +3165,16 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>>         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
>>                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
>>                 0, 2, data, size);
>> +
>> +       /* SMB2 servers responds with ACCESS_DENIED when trying to rename
>> +        * and replace onto a non-empty directory. Check for this and remap
>> +        * to EEXIST.
>> +        */
>> +       if (rc == -EACCES) {
>> +               if (!smb2_is_dir(xid, tcon, target_file, &is_dir) && is_dir)
>> +                       rc = -EEXIST;
>> +       }
>
> What if the target is directory but the permissions are read-only?
>
>> +
>>         kfree(data);
>>         return rc;
>>  }
>> diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
>> index e9ab5227e7a8..a7528c0941c6 100644
>> --- a/fs/cifs/smb2proto.h
>> +++ b/fs/cifs/smb2proto.h
>> @@ -203,4 +203,6 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
>>
>>  extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
>>                                         enum securityEnum);
>> +extern int smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
>> +                      __le16 *target_file, int *is_dir);
>>  #endif                 /* _SMB2PROTO_H */
>> --
>> 2.13.3
>>

Pavel makes good points ...



-- 
Thanks,

Steve

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[Aurélien Aptel]

Pavel Shilovsky <piastryyy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> What if the target is directory but the permissions are read-only?

I get the same resulsts on a local filesystem (xfs) and on a mounted
smb2 windows2016 share (both with and without the patch applied):

overwrite dir b with file a (with access to b)
=======================
rename("test/a", "test/b")              = -1 EISDIR (Is a directory)

overwrite dir b with file a (without access to b)
=======================
rename("test/a", "test/b")              = -1 EISDIR (Is a directory)

overwrite file b with file a (with access to b)
=======================
rename("test/a", "test/b")              = 0

overwrite file b with file a (without access to b)
=======================
rename("test/a", "test/b")              = 0

So.. I'm not sure what the xfstest test is doing.

The only difference between the local and remote fs is that for cifs you
can't delete test if you can't access test/b. (I am deleting "test"
between my tests).

That is on cifs:

  mkdir -p test/b
  chmod a-rw test/b
  rm -rf test

Will fail, but works on xfs. You you strace rm you will see:

  unlinkat(4, "b", AT_REMOVEDIR) = -1 EACCES (Permission denied)

I think this is due to the fundamental difference in how file removal
permission works in Windows vs POSIX. In POSIX you need +w on the parent
dir ("test") to be able to delete a file. On Windows there is a special
delete permission on the object itself. Not sure if this is "fixable".

Cheers,

-- 
Aurélien Aptel / SUSE Labs Samba Team
GPG: 1839 CB5F 9F5B FB9B AA97  8C99 03C8 A49B 521B D5D3
SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)

[PATCH] cifs: fix return code when failing to rename a file onto a directory

[Ronnie Sahlberg]

Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
directory. This is different from xfstest where we expect this to return
-EEXIST instead.

This makes us pass xfstest  generic/245

Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 fs/cifs/smb2inode.c |  7 +++++--
 fs/cifs/smb2pdu.c   | 10 +++++++++-
 fs/cifs/smb2proto.h |  2 +-
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index 1238cd3552f9..6ada981f1f83 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -48,6 +48,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 	struct cifs_open_parms oparms;
 	struct cifs_fid fid;
+	struct smb2_file_all_info all_info;
 
 	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 	if (!utf16_path)
@@ -60,7 +61,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 	oparms.fid = &fid;
 	oparms.reconnect = false;
 
-	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, &all_info, NULL);
 	if (rc) {
 		kfree(utf16_path);
 		return rc;
@@ -86,7 +87,9 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 		break;
 	case SMB2_OP_RENAME:
 		tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
-				    fid.volatile_fid, (__le16 *)data);
+				    fid.volatile_fid, (__le16 *)data,
+				    le32_to_cpu(all_info.Attributes) &
+				    FILE_ATTRIBUTE_DIRECTORY);
 		break;
 	case SMB2_OP_HARDLINK:
 		tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 553d574940b9..56c71a58d971 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3139,7 +3139,8 @@ send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
 
 int
 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
-	    u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
+	    u64 persistent_fid, u64 volatile_fid, __le16 *target_file,
+	    bool is_dir)
 {
 	struct smb2_file_rename_info info;
 	void **data;
@@ -3165,6 +3166,13 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 	rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
 		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
 		0, 2, data, size);
+	/* SMB2 servers responds with ACCESS_DENIED when trying to rename
+	 * and replace onto a non-empty directory. Check for this and remap
+	 * to EEXIST.
+	 */
+	if (rc == -EACCES && is_dir)
+		rc = -EEXIST;
+
 	kfree(data);
 	return rc;
 }
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index e9ab5227e7a8..69fa9a39c7fa 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -158,7 +158,7 @@ extern int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
 				struct cifs_search_info *srch_inf);
 extern int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 		       u64 persistent_fid, u64 volatile_fid,
-		       __le16 *target_file);
+		       __le16 *target_file, bool is_dir);
 extern int SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
 		      u64 persistent_fid, u64 volatile_fid);
 extern int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
-- 
2.13.3

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[ronnie sahlberg]

Hmm,

Steve, disregard and drop this patch.


We can do this much better once we have compounding support.


On Mon, Nov 20, 2017 at 3:25 PM, Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
> directory. This is different from xfstest where we expect this to return
> -EEXIST instead.
>
> This makes us pass xfstest  generic/245
>
> Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  fs/cifs/smb2inode.c |  7 +++++--
>  fs/cifs/smb2pdu.c   | 10 +++++++++-
>  fs/cifs/smb2proto.h |  2 +-
>  3 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
> index 1238cd3552f9..6ada981f1f83 100644
> --- a/fs/cifs/smb2inode.c
> +++ b/fs/cifs/smb2inode.c
> @@ -48,6 +48,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
>         struct cifs_open_parms oparms;
>         struct cifs_fid fid;
> +       struct smb2_file_all_info all_info;
>
>         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
>         if (!utf16_path)
> @@ -60,7 +61,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>         oparms.fid = &fid;
>         oparms.reconnect = false;
>
> -       rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
> +       rc = SMB2_open(xid, &oparms, utf16_path, &oplock, &all_info, NULL);
>         if (rc) {
>                 kfree(utf16_path);
>                 return rc;
> @@ -86,7 +87,9 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>                 break;
>         case SMB2_OP_RENAME:
>                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
> -                                   fid.volatile_fid, (__le16 *)data);
> +                                   fid.volatile_fid, (__le16 *)data,
> +                                   le32_to_cpu(all_info.Attributes) &
> +                                   FILE_ATTRIBUTE_DIRECTORY);
>                 break;
>         case SMB2_OP_HARDLINK:
>                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
> index 553d574940b9..56c71a58d971 100644
> --- a/fs/cifs/smb2pdu.c
> +++ b/fs/cifs/smb2pdu.c
> @@ -3139,7 +3139,8 @@ send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
>
>  int
>  SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
> -           u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
> +           u64 persistent_fid, u64 volatile_fid, __le16 *target_file,
> +           bool is_dir)
>  {
>         struct smb2_file_rename_info info;
>         void **data;
> @@ -3165,6 +3166,13 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
>                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
>                 0, 2, data, size);
> +       /* SMB2 servers responds with ACCESS_DENIED when trying to rename
> +        * and replace onto a non-empty directory. Check for this and remap
> +        * to EEXIST.
> +        */
> +       if (rc == -EACCES && is_dir)
> +               rc = -EEXIST;
> +
>         kfree(data);
>         return rc;
>  }
> diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
> index e9ab5227e7a8..69fa9a39c7fa 100644
> --- a/fs/cifs/smb2proto.h
> +++ b/fs/cifs/smb2proto.h
> @@ -158,7 +158,7 @@ extern int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
>                                 struct cifs_search_info *srch_inf);
>  extern int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>                        u64 persistent_fid, u64 volatile_fid,
> -                      __le16 *target_file);
> +                      __le16 *target_file, bool is_dir);
>  extern int SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
>                       u64 persistent_fid, u64 volatile_fid);
>  extern int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
> --
> 2.13.3
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[Steve French]

ok - makes sense - sounds like a great argument to focus on
compounding this one special case as an experiment to see how we will
do it more generally.

On Mon, Nov 20, 2017 at 3:09 PM, ronnie sahlberg
<ronniesahlberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hmm,
>
> Steve, disregard and drop this patch.
>
>
> We can do this much better once we have compounding support.
>
>
> On Mon, Nov 20, 2017 at 3:25 PM, Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>> Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
>> directory. This is different from xfstest where we expect this to return
>> -EEXIST instead.
>>
>> This makes us pass xfstest  generic/245
>>
>> Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>>  fs/cifs/smb2inode.c |  7 +++++--
>>  fs/cifs/smb2pdu.c   | 10 +++++++++-
>>  fs/cifs/smb2proto.h |  2 +-
>>  3 files changed, 15 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
>> index 1238cd3552f9..6ada981f1f83 100644
>> --- a/fs/cifs/smb2inode.c
>> +++ b/fs/cifs/smb2inode.c
>> @@ -48,6 +48,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>>         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
>>         struct cifs_open_parms oparms;
>>         struct cifs_fid fid;
>> +       struct smb2_file_all_info all_info;
>>
>>         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
>>         if (!utf16_path)
>> @@ -60,7 +61,7 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>>         oparms.fid = &fid;
>>         oparms.reconnect = false;
>>
>> -       rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
>> +       rc = SMB2_open(xid, &oparms, utf16_path, &oplock, &all_info, NULL);
>>         if (rc) {
>>                 kfree(utf16_path);
>>                 return rc;
>> @@ -86,7 +87,9 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
>>                 break;
>>         case SMB2_OP_RENAME:
>>                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
>> -                                   fid.volatile_fid, (__le16 *)data);
>> +                                   fid.volatile_fid, (__le16 *)data,
>> +                                   le32_to_cpu(all_info.Attributes) &
>> +                                   FILE_ATTRIBUTE_DIRECTORY);
>>                 break;
>>         case SMB2_OP_HARDLINK:
>>                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
>> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
>> index 553d574940b9..56c71a58d971 100644
>> --- a/fs/cifs/smb2pdu.c
>> +++ b/fs/cifs/smb2pdu.c
>> @@ -3139,7 +3139,8 @@ send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
>>
>>  int
>>  SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>> -           u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
>> +           u64 persistent_fid, u64 volatile_fid, __le16 *target_file,
>> +           bool is_dir)
>>  {
>>         struct smb2_file_rename_info info;
>>         void **data;
>> @@ -3165,6 +3166,13 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>>         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
>>                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
>>                 0, 2, data, size);
>> +       /* SMB2 servers responds with ACCESS_DENIED when trying to rename
>> +        * and replace onto a non-empty directory. Check for this and remap
>> +        * to EEXIST.
>> +        */
>> +       if (rc == -EACCES && is_dir)
>> +               rc = -EEXIST;
>> +
>>         kfree(data);
>>         return rc;
>>  }
>> diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
>> index e9ab5227e7a8..69fa9a39c7fa 100644
>> --- a/fs/cifs/smb2proto.h
>> +++ b/fs/cifs/smb2proto.h
>> @@ -158,7 +158,7 @@ extern int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
>>                                 struct cifs_search_info *srch_inf);
>>  extern int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
>>                        u64 persistent_fid, u64 volatile_fid,
>> -                      __le16 *target_file);
>> +                      __le16 *target_file, bool is_dir);
>>  extern int SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
>>                       u64 persistent_fid, u64 volatile_fid);
>>  extern int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
>> --
>> 2.13.3
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html



-- 
Thanks,

Steve

[PATCH] cifs: fix return code when failing to rename a file onto a directory

[Ronnie Sahlberg]

Cifs servers return ACCESS_DENIED when trying to rename onto a non-empty
directory. This is different from xfstest where we expect this to return
-EEXIST instead.

As a workaround, if we failed to rename the file and we got -EACCES
then try to open the target file and check the attributes if it is a
directory or not and if so remap the error to -EEXIST.

This makes us pass xfstest  generic/245

Signed-off-by: Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 fs/cifs/smb2ops.c   | 39 +++++++++++++++++++++++++++++++++++++++
 fs/cifs/smb2pdu.c   | 13 ++++++++++++-
 fs/cifs/smb2proto.h |  2 ++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index bdb963d0ba32..1c46aab0d015 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -426,6 +426,45 @@ smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 	return rc;
 }
 
+int
+smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
+	    __le16 *target_file)
+{
+	int rc;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct smb2_file_all_info *smb2_data;
+
+	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
+			    GFP_KERNEL);
+	if (smb2_data == NULL)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, target_file, &oplock, NULL, NULL);
+	if (rc)
+		goto out;
+
+	rc = SMB2_query_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
+			     smb2_data);
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+	if (rc)
+		goto out;
+
+	rc = !!(le32_to_cpu(smb2_data->Attributes) & FILE_ATTRIBUTE_DIRECTORY);
+
+out:
+	kfree(smb2_data);
+	return rc;
+}
+
 #ifdef CONFIG_CIFS_XATTR
 static ssize_t
 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 553d574940b9..91f0b4a5e749 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3144,7 +3144,7 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 	struct smb2_file_rename_info info;
 	void **data;
 	unsigned int size[2];
-	int rc;
+	int rc, is_dir;
 	int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
 
 	data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
@@ -3165,6 +3165,17 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
 	rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
 		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
 		0, 2, data, size);
+
+	/* SMB2 servers responds with ACCESS_DENIED when trying to rename
+	 * and replace onto a non-empty directory. Check for this and remap
+	 * to EEXIST.
+	 */
+	if (rc == -EACCES) {
+		is_dir = smb2_is_dir(xid, tcon, target_file);
+		if (is_dir == 1)
+			rc = -EEXIST;
+	}
+
 	kfree(data);
 	return rc;
 }
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index e9ab5227e7a8..35c075364f7e 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -203,4 +203,6 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
 
 extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
 					enum securityEnum);
+extern int smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
+		       __le16 *target_file);
 #endif			/* _SMB2PROTO_H */
-- 
2.13.3

Re: [PATCH] cifs: fix return code when failing to rename a file onto a directory

[Aurélien Aptel]

Hi Ronnie,

Ronnie Sahlberg <lsahlber-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> writes:
> +int
> +smb2_is_dir(const unsigned int xid, struct cifs_tcon *tcon,
> +	    __le16 *target_file)

I think I'd feel better if the actual result was an out parameter rather
than mixed with errors in the return value.

> +	if (rc)
> +		goto out;
> +
> +	rc = !!(le32_to_cpu(smb2_data->Attributes) & FILE_ATTRIBUTE_DIRECTORY);
> +
> +out:
> +	kfree(smb2_data);
> +	return rc;

I think this can hide EPERM (errno 1) errors.

Also it's too bad we have functions taking in utf16 params and some not
but that's a whole another story. I had this idea of introducing a path
struct and only serialize it at the very last moment which I'll try to
implement ..one day :)

-- 
Aurélien Aptel / SUSE Labs Samba Team
GPG: 1839 CB5F 9F5B FB9B AA97  8C99 03C8 A49B 521B D5D3
SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)